<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #contentDiv{
        width: 1000px;
        height: 800px;
        margin: 0 auto;
        border: 1px solid #000;
        }
    </style>
</head>
<body>
<div id="contentDiv">
    <h1 style="text-align: center">权限管理</h1>

    <div STYLE="display: flex">

        <div style="width: 200px ; height: 400px">

            <div><a href="user/user.html" target="contentIframe">用户管理</a></div>
            <div><a href="role/role.html" target="contentIframe">角色管理</a></div>
        </div>



        <iframe style="width:600px;height:500px"
                name="contentIframe"></iframe>
    </div>

</div>

</body>
</html>